Passing mode

view1.clipsToBounds = YES;//Cutting View1 view
       

 view1.autoresizesSubviews = YES;//Sub -view automatically adapts to the size, set in the father’s view

 view2.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleleftMargin; // The adaptation method of the sub -view in the father’s view, set in the sub -view

  imageView.contentMode = UIViewContentModeScaleAspectFill; // The picture mode in the view

    
mobile       
       
    [self.view insertSubview:view3 atIndex:1];
    [self.view sendSubviewToBack:view2];
    [self.view bringSubviewToFront:view1];
   

    [self.view exchangeSubviewAtIndex:0 withSubviewAtIndex:2];
    [view1 isDescendantOfView:self.view]